- 行业: Mining
- Number of terms: 33118
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- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A door erected in a roadway to prevent the passage of air. When doors are erected between an intake and a return airway, they may be known as separation doors.
Industry:Mining
A door erected in a roadway to prevent the passage of air. When doors are erected between an intake and a return airway, they may be known as separation doors.
Industry:Mining
A door erected in a roadway to prevent the passage of air. When doors are erected between an intake and a return airway, they may be known as separation doors.
Industry:Mining
A door erected in a roadway to prevent the passage of air. When doors are erected between an intake and a return airway, they may be known as separation doors.
Industry:Mining
A door in a mine level whose purpose it is to regulate ventilation currents. A trapdoor.
Industry:Mining
A door or gate that can be opened or closed to regulate the discharge of material from a hopper, bin, or chute.
Industry:Mining
A door so placed as to direct and regulate the amount of air current necessary for the proper ventilation of a district of a mine.
Industry:Mining
A dose of ionizing radiation sufficient to cause death. Median lethal dose (also abbreviated LD<sub>50</sub>) is the dose required to kill half of the individuals in a group similarly exposed within a specified period of time. The median lethal dose for humans is about 400 rads.
Industry:Mining
